Loud speaker



E. A. SHANKWEILER sept.- 6,1927.

` LOUD S-PEAKER @ttor/nass Patented Sept. 6, 1927.

f j UNITED l sTATEs EARL A. SHANKWEILER, or ALLEN'rowN-PENNSYLVANIA.

` LOUD SPEAKER.

Application led December 7l 1925.` Seria1,No. '73,752. i

This invention relates to a loud speaker designed primarily for use in connection with radio receiving sets, one of the objects of the invention is to provide a loud speaker in the form of a pedestal which can be used for supporting a lamp or other object and the construction of which is such as to insure the clear reproduction Vof the tones without objectionable vibrations.

A further object is to provide a loud speaker` which will constitute an ornamental article of furniture.

It is well known to those skilled in the art that best amplifying results are obtained by the use of a long sound chamber the walls of which are formed of a resonant material such as wood. It has not been possible7 heretofore. to ordinarily` embody these features in loud -speaker constructions.

It is an` object of the present invention to provide an article of furniturein which a sound chamber having the foregoing` qualities can be produced.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, 'it being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings the pre- 35 ferred form of-the invention has been shown.

In ysaid drawings, Figure 1 is a front elevation of the device. Figure 2 is a section on line 2-2 Figure 1. Figure 3 is a section on line 3-3 Figure 1. Figure 4 is a section on line 4-4 Figure 1. Referring to the figures by characters of reference 1 designates a base rwhich can be suitably ornamented and preferably mount vided in the upper portion of one wall.k

This opening is adapted to rbe closed means of one or more doors 8.

' The corner portions of the standards are beveled as shown at 9 and. are provided with finishing strips 10 made up of inolding'of anyV desired configuration. One of these strips has Y aflongitudinal groove 11 in its inner .face `thus tovconstitute ay conduit through which insulated wires 12 of a lightingsystem can be extended to a receptacle 13 secured within a cap 14 constituting the top of the pedestal.

An opening 15 is provided in the lower end of the stem or shank 4 for the reception of the tubular outlet 16 of a loud speaker unit 17. From this opening, the inner faces of the walls of the pedestal diverge gradually toa point approximately 14 Aabove the lower end of the standard so that the sound chamber increases in width from approximately 3/8 at the lower end to approximately 1% at the point a which, as before stated, is about 14 above th`e lower end of the sound chamber 18.

From the point a the inner surfaces of the walls of theV standards diverge at a greater angle up to a point approximately 261/2" sor above the lower end of the sound chamber and which point has been indicated at b. A shoulder ,19 is formed along the inner surface of the back wall at thepoint b and serves to support the lower end of a wall. 20 which curves upwardly and forwardly and abiits against the front wall of the pedestal directly'over'the opening 7. This wall constitutes a sound defiector. The upper endk of the pedestal is approximately 8778 above the point b and the walls at the upper ends are approximately thick and increase in vthickness to 11/g at the point a.

The specific measurements have been set forth herein because it has been found important to proportion the pedestal as outlined in order to produce the best possible results. As the sound chamber increases in size thev Walls become thinner and theresonance of the chamber is thus correspondingly increased while the lower or restricted ortion of the chamber is provided with t ick ,walls ywhich reduce to the minimum the vibrations resulting* from the reception of sound waves from the unit 17.

By providing the receptacle 13 in the cap 14 of the pedestal it is possible to place on the pedestal a lamp and to insert a lamp may be built onto the pedestal. In

ioof` lug into the receptacle 13. Or, if ldesire a` iov either instance the Wires contained Withn the pedestal are concealed both within and Without.

By swinging the doors 8 the-volume of tone issuing from the structure can be regulated, as Will be obvious.

What is Claimed is:

In a loud speaker the combination with a base, legs supporting the same, there being an opening in the base, of a pedestal including upwardly dverging Walls having reduced lower ends cooperating to provide a shank seated within the opening, there being shoulders at the upper end of the shank bearing upon the base, the walls of the pedestal being of varying thickness to provide a. lower sound chamber and an upper sound Chamber the walls of whleh diverge upwardly, the walls of the upper sound Chamber divergngr at a `jl-eater angle than the walls of the lower sound rhznnher but mergingv tlierewth at the xnee, 5,; ends ot the Chambers, there being an opening in the lower end of the pedestal for the reeep tion of the loud speaker unit and an opening in the upper end olf one oi the walls, and a curved detleethugj wall hack or' the last named opening; for del'leeting sound faves from the upper sound chamber to the openw ing- 4 In testimony that I claim the foregoing as my own, I have hereto affixed my signature.l

EARL A.' SHANKWEILER. 

